Enter the allowable stress intensity factor for the membrane at the pad edge. This factor is multiplied by the allowable stress f to obtain maximum allowable stress for the membrane. These stresses are in rows 32, 33 and 34 in the printout samples in PD 5500 Annex W.
At the edge of the reinforcement pad, this factor normally has a maximum value of 1.2.
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The example in Annex W does not compute the membrane stress at the attachment edge. You must check the membrane stress before entering a value for Wall Thickness.
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According to Annex G, the membrane stress at the attachment edge contains intensified stresses due to the presence of the hole.
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If you would like to check the membrane stress at the attachment edge, see Print the Membrane Stress? and Factor for Membrane (Attachment Edge).